Created
September 19, 2024 16:41
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| package main | |
| import ( | |
| "fmt" | |
| "math/rand" | |
| "net/http" | |
| "time" | |
| "github.com/gorilla/websocket" | |
| ) | |
| type DataPoint struct { | |
| Timestamp time.Time `json:"timestamp"` | |
| Temperature float32 `json:"temperature"` | |
| } | |
| func main() { | |
| conn, _, err := websocket.DefaultDialer.Dial("ws://localhost:8888/data", http.Header{}) | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| ticker := time.Tick(2 * time.Second) | |
| for { | |
| select { | |
| case <-ticker: | |
| dataPoint := DataPoint{ | |
| Timestamp: time.Now(), | |
| Temperature: float32(rand.NormFloat64()*5 + 20), | |
| } | |
| fmt.Printf("[%s] %.2fºC\n", | |
| dataPoint.Timestamp.Format(time.RFC3339), | |
| dataPoint.Temperature, | |
| ) | |
| err = conn.WriteJSON(dataPoint) | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| } | |
| } | |
| } |
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| package main | |
| import ( | |
| "errors" | |
| "fmt" | |
| "net/http" | |
| "time" | |
| "github.com/gin-gonic/gin" | |
| "github.com/gorilla/websocket" | |
| ) | |
| type DataPoint struct { | |
| Timestamp time.Time `json:"timestamp"` | |
| Temperature float32 `json:"temperature"` | |
| } | |
| var upgrader websocket.Upgrader | |
| func data(ctx *gin.Context) { | |
| c, err := upgrader.Upgrade(ctx.Writer, ctx.Request, nil) | |
| if err != nil { | |
| ctx.AbortWithError(http.StatusInternalServerError, err) | |
| return | |
| } | |
| defer c.Close() | |
| var dataPoint DataPoint | |
| for err := c.ReadJSON(&dataPoint); err == nil; err = c.ReadJSON(&dataPoint) { | |
| fmt.Printf( | |
| "[%s] %.2fºC\n", | |
| dataPoint.Timestamp.Format(time.RFC3339), | |
| dataPoint.Temperature, | |
| ) | |
| } | |
| if err != nil { | |
| ctx.AbortWithError(http.StatusInternalServerError, err) | |
| return | |
| } | |
| ctx.Status(http.StatusOK) | |
| } | |
| func main() { | |
| r := gin.Default() | |
| r.GET("/data", data) | |
| err := r.Run(":8888") | |
| if !errors.Is(err, http.ErrServerClosed) { | |
| panic(err.Error()) | |
| } | |
| } |
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